"As a Merchant you will be able to hold up to 15 pets and can only hatch 1 pet per day."
(Ranchers are allowed 25 pets, and can hatch 3/day.)
Merchants gain a 10% discount at game shops,
Ranchers gain a 10% benefit of being more able to hatch colored pets.
Question from me:
Are merchants allowed to sell, trade, or auction their pets at all?